> and a service that can’t tolerate any downtime is (theoretically) a service that is worth a lot to a lot of people- which is perfect for monetizing.

The connection makes sense but one must not think in this order. One must think “people will pay for this” and then consider “does this need to be highly available?”

If you have more than one road to choose from, and one of them doesn’t require high availability, then give that one some bonus points for that.